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|  MIL-P-17639F(SH)
3.2.4 Alinement.
3.2.4.1 The design of all pumps shall be such that alinement will not be
disturbed or undue stresses set up in any part by normal vibration or contraction
and expansion of piping attached thereto in service.
3.2.4.2 Alinement between separate components of a unit shall be maintained
by means of keyways, rabbeted or tongue and groove joints, fitted bolts, or other
means. Parts manufactured to the same drawings shall be interchangeable.
3.2.4.3 In no case shall a piece of equipment be rigidly supported from
more than one plane.
3.2.5 Noise. The design, construction ", and workmanship of the equipment
shall be such that noise levels during operation at the design conditions will
meet the airborne noise and structureborne vibration noise requirements as
specified (see 6.2.1 and 4.6.4).
Mounting.
3.2.6
3.2.6.1 Class C-1 pump units shall be horizontally or vertically mounted,
as specified (see 6.2.1).
3.2.6.2 Class C-2 pump units shall be horizontally mounted.
3.2.6.3 Each horizontal flexible coupled pump and separable driving unit,
complete with all appurtenances, shall be mounted on a common bedplate.
3.2.6.4 Bedplates shall be sufficiently rigid to permit handling, shipment,
and installation of the units on board ship, to minimize misalinement of the
assembled units; and such that normal distortion, weaving or vibration of the
supporting structures on board ships cannot cause misalinement between the pumps
and driving units.
3.2.6.5 Bearing and seating surfaces of bedplates shall be finish machined.
3.2.6.6 Each component part of an assembled flexible coupled unit supported
directly by a bedplate shall be doweled thereto to facilitate reassembly and main-
tenance of alinement, except that final doweling of the driver shall be performed
by the installing activity after final installation. The manufacturer shall
furnish a warning plate indicating the above.
3.2.6.7 Vertical pumps shall be base mounted or center of gravity mounted.
The base and support bracket shall have provisions for bolting to a foundation.
Pumps which are resiliently mounted shall be supported as close to the center of
gravity as practical.
3.2.6.8 Bedplates shall be of cast steel or structural steel fabricated
by welding.
3.2.6.9 In the event special bulkhead mounting is required, sideplates
shall be furnished subject to all conditions specified for bedplates (see
3.2.6.3 through 3.2.6.5 and 3.2.6.7).
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